Would it make economic sense for the U.S. government to gradually build a diversified sovereign wealth fund despite its existing debt?
I'm wondering about this primarily as a question of the federal government's long-run balance sheet.
Suppose the U.S. established an independently managed sovereign wealth fund with a mandate to hold a passive, highly diversified market portfolio. It would be capitalized gradually through regular federal appropriations rather than through a large one-time issuance of debt.
Over sufficiently long periods, a diversified equity portfolio has a higher expected return than Treasuries. The federal government also has an unusually long investment horizon and greater capacity to ride out market volatility than an ordinary investor.
So, in principle, could it make economic sense for the federal government to deliberately maintain some leveraged exposure to diversified productive assets using their own debt creating ability?
Or does the U.S.'s existing debt burden make it unacceptable to attempt making a spread?
Has anyone written about or modeled this idea?